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A car covers its outward journey at 40kmph. It is towed back, over exactly the same distance at 10mph. What is the average speed over the entire journey? A)12mph B)14mph C)15mph D)20mphAns :D

SUDHARSANA V V , 6 Years ago
Grade 10
anser 2 Answers
Arun

Last Activity: 6 Years ago

Dear student
 
we can apply the formula 2xy/(x+y) for average speed.
Hence
 
Avg speed = 2*40*10/(40+10) = 800/50 = 16 kmph
 
Regards
Arun (askIITians forum expert)

Arun

Last Activity: 6 Years ago

 
Sorry,the above soltuion is incorrect due to not taking conversion
 
40 kmph = 40/1.6 mph = 24.85 mph
 
Now avg speed = 2*24.85*10/34.85 = 14.26 mph
 
Hence option B is correct

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